<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
        "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
    <title>jQuery对象为数组对象</title>
    <meta charset="utf-8">
    
</head>
<body>
    <div></div>
    <br><br>
    <div></div>
    <br><br>
    <input type="button" id="hideBtn" value="隐藏所有div"/>
    <input type="button" id="colorBtn" value="改变第一个div颜色"/>
</body>
</html>